Ultimately the bond of all companionship, whether in marriage or in friendship, is conversation, and conversation must have a common basis, and between two people of widely different culture the only common basis possible is the lowest level.
Agitators are a set of interfering, meddling people, who come down to some perfectly contented class of the community and sow the seeds of discontent amongst them. That is the reason why agitators are so absolutely necessary. Without them, in our incomplete state, there would be no advance towards civilization.